Cygwin being GPL licensed, we cannot distribute Titan for Cygwin as GPL conflicts with EPL. (However we cannot stop users from building it on Cygwin).

In the long term I think Windows 10 and WSL (Windows Subsystem for Linux) it's a more desirable option than Cygwin , if one wants to execute Titan on a Windows machine.
WSL just became generally available for all Windows 10 users ( and not only to ones subscribed to the Creator updates) in October. Windows 10 can host Ubuntu, openSuSe, SLES as Linux subsystems , and can do that even in parallel!

The Eclipse plug-ins can be installed in Windows and talk to the Linux side (which does not support graphics) via an X server such as Xming.
Se my previous posts about the subject. I intend to come back to this with updates.